It's an age-old evolutionary question: Why do some men go bonkers for b**bs while others are struck with a lifelong case of booty-fever? Much to the delight of ass-men everywhere, Playboy's team of posterior historians whipped together an ass-tastic educational video about man's love of the female buttock throughout the ages. It's full of all sorts offactoids to impress your friends with over happy hour. For example, did you know most pre-20th-century art suffered from a serve lack of ass shots? Or that most historians trace modern infatuation with a woman's backside to an early-1800s London exhibition named "The Hottentot Venus"? Another nugget of knowledge: Over a century before Sir Mix-a-Lot proclaimed that "Baby got back," badunkadunk butts became all the rage in the 1870s. Props to Hef and the gang for putting out something that's sexy, yet also informative. Must-watch video after the jump.